Remote Sensing Interpretation Of Ore–controlling Structure Of Gold Deposits In The Eastern Junggar Metallogenic Belt,Xinjiang

There are five strong–strain tectonic belts in the East Junggar region that are closely related to gold deposits.From the north to the south are the Mainebo belt,the Burgen belt,the Aermantai belt,the Kubusu belt and the Kalamaili belt.In the Aermantai –Zhaheba tectonic belt and its secondary faults,several gold ore deposits were discovered,including the Yundu Kala gold deposit,Tasikake gold deposit,Qiakuertu gold deposit and Wenggeerkuola gold deposit in the Zhaheba area.The Dunbasitao Gold Mine in the Aermantai region.Through the field geological mapping and field route investigation in the Qiakuertu area,structural geometry and kinematic investigations were carried out on the structures,joints,faults and other structures of the study area,and the structural period and the structural combination were determined.Combined with remote sensing images,the structure of the study area was interpreted.Four stages of structure were divided in the study area.The first stage was northwestward,mainly for ductile–brittle deformation.The second stage was northeastward,with brittle deformation as the main.The third period is near east–west direction,with east–west strike–slip deformation as the main stage;the fourth stage is near–south–south direction brittle deformation.Through the study of the strata,intrusive rocks,ore body characteristics and ore characteristics in the five gold deposits in theAermantai-Zhahebaregion,I summary the influence of every period structure on the control of gold deposits and the interaction between the various structures on the gold mineralization,summarizing the orecontrolling factors of the gold deposits in the area,and considering that the gold deposits in the Aermantai-Zhaheba area are strictly subjected to toughness-brittleness.Deformation control,and developed at the intersection of the primary fracture and the secondary fracture.In the middle of the Early Devonian,the Aermantai ocean basin subducted to the northeast.At this time,the tectonic movement was dominated by the push-over background,and the right-hand shear deformation was formed,forming different grades of ductile shear.In the Early Carboniferous Aermantai finite ocean basin closed,and a strong orogenic effect occurred.The Aermantai region changed from extrusion to post-orogenic extensional environment.During this period,the Aermantai region was dominated by brittle deformation.Various cracks or weak zones in the ductile shear structure system formed in the early stage form a tensile space during the brittle deformation process,which constitutes a good ore-bearing space.The surrounding rocks of the gold deposits in the Aermantai –Zhaheba area are generally strongly altered,mainly characterized by limonite mineralization,carbonation and silicification.The ETM image is used to extract the iron dye and hydroxyl alteration information from the study area.The remote sensing anomaly is highly consistent with the distribution of gold deposits.The remote sensing anomaly is analyzed.The remote sensing anomaly distribution is consistent with the regional tectonic line direction,and the more obvious the structure is,the more obvious the anomaly is.The remote sensing anomaly is less developed away from the linear structure.Based on the study of structural ore–control laws and remote sensing anomalies,three prospecting areas were identified in the Aermantai region,including south Saertuohai,Sandektas,and Tuorangkuduke.